On the official forum, one of the developers wrote that the game is in multiplayer mode every time, so that's why they couldn't build in "pause".
It is a bug to me, why can't they build in a player number check? If it is"1" pause is allowed. If it is 2 or more, then pause is not allowed. Can't believe it is so difficult.

There is a problem with light effects, at certain places all the lights disappear, at least one broken quest I found, quest markers sometimes missplaced and so on.
There is a lot to do, this visual effects are so unimportant.